The occurrence of the after-cataract and the patient's age of undergoing surgery; the size of the capsular bag; continuity of capsule mouth; blood aqueous humor barrier damages released inflammation medium; residual lens epithelial cell migration differentiation and the amount of lens cortex; other factors of the artificial lens implantation, such as material. The after-cataract is the most common complication of cataract surgery and is the main reason of the visual acuity decline after surgery. In present study, we summarized the prevention method of after-cataract.